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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code | 
|---|---|
| 696 |      /** | 
| 697 |       * Filters the date the last post or comment in the query was modified. | 
| 698 |       * | 
| 699 |       * @since 5.2.0 | 
| 700 |       * | 
| 701 |       * @param string|false $max_modified_time Date the last post or comment was modified in the query, in UTC. | 
| 702 |       *                                        False on failure. | 
| 703 |       * @param string       $format            The date format requested in get_feed_build_date(). | 
| 704 |       */ | 
| 705 |      return apply_filters( 'get_feed_build_date', $max_modified_time, $format ); | 
| 706 | } | 
| 707 |  | 
| 708 | /** | 
| 709 |  * Return the content type for specified feed type. | 
| 710 |  * | 
| 711 |  * @since 2.8.0 | 
| 712 |  * | 
| 713 |  * @param string $type Type of feed. Possible values include 'rss', rss2', 'atom', and 'rdf'. | 
| 714 |  */ |